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[PATCH] PCI: Provide a boot parameter to disable MSI

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Several drivers are starting to grow options to disable MSI.  However,
it's often a host chipset issue, not something which individual drivers
should handle.  So we add the pci=nomsi kernel parameter to allow the user
to disable MSI modes for systems we haven't added to the quirk list yet.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthew Wilcox
2006-03-05 22:33:34 -07:00
committed by Greg Kroah-Hartman
parent 5eeca8e688
commit 309e57df7b
5 changed files with 26 additions and 2 deletions
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10
drivers/pci/msi.c
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@@ -765,8 +765,11 @@ void pci_disable_msi(struct pci_dev* dev)
u16 control;
unsigned long flags;
if (!pci_msi_enable)
return;
if (!dev)
return;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!pos)
return;
@@ -1026,6 +1029,8 @@ void pci_disable_msix(struct pci_dev* dev)
int pos, temp;
u16 control;
if (!pci_msi_enable)
return;
if (!dev)
return;
@@ -1152,6 +1157,11 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
}
}
void pci_no_msi(void)
{
pci_msi_enable = 0;
}
EXPORT_SYMBOL(pci_enable_msi);
EXPORT_SYMBOL(pci_disable_msi);
EXPORT_SYMBOL(pci_enable_msix);